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9 commits

Author SHA1 Message Date
beorn7 c3c7d44d84 lint: Adjust to the lint warnings raised by current versions of golint-ci
We haven't updated golint-ci in our CI yet, but this commit prepares
for that.

There are a lot of new warnings, and it is mostly because the "revive"
linter got updated. I agree with most of the new warnings, mostly
around not naming unused function parameters (although it is justified
in some cases for documentation purposes – while things like mocks are
a good example where not naming the parameter is clearer).

I'm pretty upset about the "empty block" warning to include `for`
loops. It's such a common pattern to do something in the head of the
`for` loop and then have an empty block. There is still an open issue
about this: https://github.com/mgechev/revive/issues/810 I have
disabled "revive" altogether in files where empty blocks are used
excessively, and I have made the effort to add individual
`// nolint:revive` where empty blocks are used just once or twice.
It's borderline noisy, though, but let's go with it for now.

I should mention that none of the "empty block" warnings for `for`
loop bodies were legitimate.

Signed-off-by: beorn7 <beorn@grafana.com>
2023-04-19 17:10:10 +02:00
beorn7 1cfc8f65a3 histograms: Return actually useful counter reset hints
This is a bit more conservative than we could be. As long as a chunk
isn't the first in a block, we can be pretty sure that the previous
chunk won't disappear. However, the incremental gain of returning
NotCounterReset in these cases is probably very small and might not be
worth the code complications.

Wwith this, we now also pay attention to an explicitly set counter
reset during ingestion. While the case doesn't show up in practice
yet, there could be scenarios where the metric source knows there was
a counter reset even if it might not be visible from the values in the
histogram. It is also useful for testing.

Signed-off-by: beorn7 <beorn@grafana.com>
2023-01-25 16:57:21 +01:00
beorn7 57c18420ab histograms: General readability tweaks
- Adjust doc comments to go1.19 style.
- Break down some overly long lines.
- Minor doc comment tweaks and fixes.
- Some renaming.

Some rationales for the last point:

I have renamed “interjections” into “inserts”, mostly because it is
shorter, and the word shows up a lot by now (and the concept is
cryptic enough to not obfuscate it even more with abbreviations).

I have also tried to find more descriptive naming for the “compare
spans” functions.

Signed-off-by: beorn7 <beorn@grafana.com>
2023-01-19 13:26:42 +01:00
Ganesh Vernekar 57bcbf1888
Merge pull request #11783 from codesome/gauge-histogram
tsdb: Add gauge histogram support
2023-01-10 19:06:08 +05:30
Ganesh Vernekar 3c2ea91a83
tsdb: Test gauge float histograms
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
2023-01-10 18:35:37 +05:30
Ganesh Vernekar 8ad0d2d5d7
tsdb: Find union of two sets of histogram spans
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
2023-01-10 17:43:33 +05:30
Ganesh Vernekar d7f5129042
tsdb: Add logic to determine appendable gauge float histograms
This is to check if a gauge histogram can be appended to the given chunk.
If not, it tells what changes to make to the chunk and the histogram
if possible.

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
2023-01-10 17:43:33 +05:30
Ganesh Vernekar b42802af9a
tsdb: Improve TestFloatHistogramChunkAppendable and add new cases
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
2022-12-28 21:07:47 +05:30
Ganesh Vernekar 6fd89a6fd2
Add chunk encoding for float histogram (#11716)
Signed-off-by: Marc Tudurí <marctc@protonmail.com>
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
Co-authored-by: Marc Tudurí <marctc@protonmail.com>
2022-12-20 15:33:32 +05:30